No.2 ESS (EMERGENCY STOP SIGNAL SYSTEM) OPERATES WHILE NOT UNDER OPERATION CONDITIONS [EMERGENCY STOP SIGNAL SYSTEM (ESS)]

id0903j7004400

2

ESS (Emergency Stop Signal system) operates while not under operation conditions

DESCRIPTION

•  Hazard warning lights flash while driving

•  Hazard warning lights flash even though deceleration is done without decelerating rapidly.

POSSIBLE CAUSE

Hazard warning light flash malfunction

•  Hazard warning switch malfunction (temporary short circuit caused by vibration while vehicle is driven)

―  Hazard warning switch malfunction

―  Short circuit to ground in wiring harness between hazard warning switch and BCM terminal 5M

•  BCM malfunction (hazard warning light flash circuit disabled)

BCM does not recognize sudden deceleration hazard warning mode request signal

•  DSC/RSC CM malfunction (false signal is output)

•  BCM malfunction

•  Communication error between DSC/RSC CM and BCM

Sudden deceleration wheel speed is detected

•  Grip level of tires is low

―  Driving on a low-traction surface

―  Tire wear (hydroplaning)

Diagnostic Procedure

Step

Inspection

Action

1

VERIFY DTCs

•  Retrieve DTCs for the PCM, DSC/RSC CM, and BCM.
(See ON-BOARD DIAGNOSTIC TEST [MZI-3.7].)

(See ON-BOARD DIAGNOSIS [DSC/RSC].)

(See DTC INSPECTION [BCM].)

•  Are any DTCs output?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZI-3.7].)

(See ON-BOARD DIAGNOSIS [DSC/RSC].)

(See DTC TABLE [BCM].)

No

Go to the next step.

2^*

DETERMINE IF MALFUNCTION CAUSED BY HAZARD WARNING SWITCH SIGNAL ERROR

•  Monitor the BCM PIDs “HAZARD” using the M-MDS:
(See PID/DATA MONITOR INSPECTION [BCM].)

•  Are the monitoring values normal?

Yes

Go to Step 4.

No

Go to the next step.

3

INSPECT HAZARD WARNING SWITCH FOR MALFUNCTION

•  Inspect the hazard warning switch.
(See HAZARD WARNING SWITCH INSPECTION.)

•  Is the hazard warning switch normal?

Yes

Repair for a short to ground in the wiring harness between the hazard warning switch and BCM terminal 5M.

No

Replace the hazard warning switch.

(See HAZARD WARNING SWITCH REMOVAL/INSTALLATION.)

4

INSPECT TIRES FOR MALFUNCTION

•  Inspect the tires for the following:

―  Tire air pressure (are all four tires at recommended pressure?)

―  Tire wear condition (is tire wear uniform on all four tires, or is it different?)

―  Tire size

•  Are the tires normal?

Yes

System may be affected by road conditions (emergency braking warning system is normal).

If the malfunction recurs, replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

Adjust the malfunctioning tire or replace the tire.

Step	Inspection		Action
1	VERIFY DTCs • Retrieve DTCs for the PCM, DSC/RSC CM, and BCM. (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7].) (See ON-BOARD DIAGNOSIS [DSC/RSC].) (See DTC INSPECTION [BCM].) • Are any DTCs output?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].) (See ON-BOARD DIAGNOSIS [DSC/RSC].) (See DTC TABLE [BCM].)
1		No	Go to the next step.
2^*	DETERMINE IF MALFUNCTION CAUSED BY HAZARD WARNING SWITCH SIGNAL ERROR • Monitor the BCM PIDs “HAZARD” using the M-MDS: (See PID/DATA MONITOR INSPECTION [BCM].) • Are the monitoring values normal?	Yes	Go to Step 4.
2^*		No	Go to the next step.
3	INSPECT HAZARD WARNING SWITCH FOR MALFUNCTION • Inspect the hazard warning switch. (See HAZARD WARNING SWITCH INSPECTION.) • Is the hazard warning switch normal?	Yes	Repair for a short to ground in the wiring harness between the hazard warning switch and BCM terminal 5M.
3		No	Replace the hazard warning switch. (See HAZARD WARNING SWITCH REMOVAL/INSTALLATION.)
4	INSPECT TIRES FOR MALFUNCTION • Inspect the tires for the following: ― Tire air pressure (are all four tires at recommended pressure?) ― Tire wear condition (is tire wear uniform on all four tires, or is it different?) ― Tire size • Are the tires normal?	Yes	System may be affected by road conditions (emergency braking warning system is normal). If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
4		No	Adjust the malfunctioning tire or replace the tire.